/Engine/Plugins/Animation/LiveLinkCurveDebugUI/Source/LiveLinkCurveDebugUI/Public/SLiveLinkCurveDebugUI.h
If we don't have a suplied CachedLiveLinkSubjectName, we try to pull it from LiveLink by looking at All available subjects and picking the first one we find with curves to supply
virtual void ChangeToNextValidLiveLinkSubjectName()